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The same stock coil type was used on 2.2 and 2.5 engines also. So I don't think there is any reason to think it's NOT working just fine igniting 20~40% less cylinder volumes worth of fuel in your engine. If it needs replaced (they can fail, seen it twice in like 1000 cars), replace it with a good, OE japanese original either new or used. Used is fine they fail so seldom. People like to bolt on goodies, and then feel like it's been a "performance" upgrade that they've accomplished. Most of these types of "upgrades" are worth little or even worse than nothing. "Cold air" intakes, "hi-Flow air filters" and "Performance" coils are among the 3 worst ideas to do to a car in general, and definitely to subaru. The "stock" setup already provides, cold, well filtered, water separated air and a nice hot, japanese made, Transistor driven coil pack provides the spark reliably. There is nothing to be gained other than spending money on "feels". Generic coil won't perform better and won't last as long...they never do. People used to want to put MSD yellows and silvers into EA cars and they crapped after a few years, while the stock hitachi's in the 80's cars mostly all still work great 30+ years. And don't even get me started on "hi flow" filters.....might as well throw a handful of dirt right down the throttle body. None of that stuff is necessary for a non-biuilt engine. If you've put high lift/duration cams, ported the heads, added forced induction, and addded larger injectors AND have the engine management to support all that, you might maybe see some gain from a true coil upgrade and opening up the intake and filtration. Even then, that's at the expense of long term wear on the engine. That stuff is for racing where engines get torn down and serviced or replaced regularly. Hope that sounds pragmatic, not personal. That's a damn good Loyale you got.

could also rotate them front to the back for a quick test. not entirely conclusive but easy.

Your right. I meant ACCEL MSD has a pretty solid track record. Although on an NA EJ18, it would not really do much if anything.

Yup. Wipe down with lacquer thinner, or spray with brake clean and let dry before installing gasket. I personally dislike the bristle discs. They are fast, but can damage block if used too aggressively. even the white ones. I am sure GD and hopefully his workers know how to use them correct, but since I do just one or 2 a month I go the slow, by hand route to clean.

I'm not looking ...I have an EJ22 sealed in a box, an EJ20 in a Brumby, coupla ECUs and messy cut to bits looms all going nowhere while enjoy the 12 years of collecting and tinkering - my AWD ea82T Brumby i may sneak back later to look